Reversing mechanism for machine-tools.



PATENTED SEPT. '26, 1905.

RB. GOOKBURN. v REVERSING MEGHANISM FOR MACHINE TOOLS.

APPLICATION FILED JAN. 3. 1905.

UNITED STATES oFFioE.

FRANCIS B. OOCKBURN, O RLDGW Y, PENNSYLVANIA.

REVERSING MECHANISM FOR MACHINE-TOOLS.

To all whom it may concern.-

Be it known that I, FRANors B. CocKBURN, a subject of the King ofEngland, residing at Ridgway, in the county of Elk and State ofPennsylvania, have invented Improvements in Reversing Mechanism forMachine-Tools,

. of which the following is a specification.

shaftsjournaled in said frame, a pulley on; each of said shafts, meansfor turning said shafts in opposite directions, a drive-shaft for themachine to be operated, a ulley on the drive-shaft, belts passing aroundthe lastaforesaid pulley and respectively around the pulleys mounted insa1d frame, means for rocking said frame in one direction or the otherto tighten one or'the other of said belts, means for automaticallyoperating the aforesaid means, means for returning and maintaining saidframe in a normal central position, and means for limitin the rockingmovement of said frame, all 0 which will be hereinafter moreparticularly described.

In the drawings, Figure 1 is an end elevation illustrating my improvedreversing mechanism as embodied in a planer. Fig. 2 is a front elevationof the same. Fig. 3 is a plan of the same, and Fig. 4 is a diagrammaticview illustrating a modification of the means for driving the mechanism.

a represents the bed of the machine to be operated, which I haveconveniently illustrated as the bed of a planer.

t represents a standard secured in the bed a, and c a bracket which issupported by the standard I). The bracket 0 is provided withupright23-in which a rocking frame at is pivotally mounted upon suitableshort shafts d, secured in the upper ends of the uprights 2. Shafts e fare journaled in the frame (1, and on one end of the shaft ,6 a gear 3is secured and on the corresponding end of the shaftf a gear 4 issecured, said gears 3 and 4 meshing with one another and are, moreover,adapted to be changeable for the urpose of varying the relative speedsofpulleys g and it. On

the opposite. end of the shaft 6 a gear 5,

Specification of Letters Patent. application filed January 3, 1965-Serial No. 239,365-

Patented. Sept. 26, 1905.

one end of which is preferably j ournaled in the same bearing as theinner shaft (1, and this shaft 7 (which may be termed an intermediateshaft) is connected to the power-shaft directly or by means of a beltand pulley, as may be found expedient. Gears 3 and 4 are omitted fromFig. 2 in order to more clearly illustrate the other arts.

9 represents a pulley which is mounted on the shaft 6, and h a similarpulley, which is mounted on'the shaft 1 meshing with the gear 6, securedon a shaft 7,

' 8 is a drive-shaft for the planer, and 9 a suitable yoke secured tothe base a and in which at one end the shaft 8 is j ournaled.

i represents a pulley mounted on the shaft 8, an 7c Z are belts whichpass around. the

pulley '11 and respectively around the pulleys g and h.

rection or the other to tighten either the belt lor the belt 7c, andthis piston may be operated manually or automatically by the operationof the machine. In the present case this automatic operation may beeffected through the arm 13, connected to the valvestem of the cylinderm, a link 14 connecting the arm 13 with an arm 15, which latter isconnected to a rod 16, journaled in suitable bearings secured to theside of the standard I), an arm 17, connected to the rod 16, and a rod18, connecting the arm 17 with an arm 19, which latter is secured to' adog n, pivotally connected to the base of the machine at.20 and providedwith lugs 21 22, the lug 21 being so placed as to contact with anadjustable block 23 and the lug 22 with an adjustable block 24, whichblocks may be caused to travel with the frame of the machine and bywhich it is believed it will be apparent that cured to the frame (1 in adepen 26, mounted on a suitable shaft 27, fixed in the bracket 0;

weight 29;;by means of which, acting through An arm 28 is fixed to thepin-. ion 26, and at the end of the arm 28 is a 7 5 m represents acylinder, which is convenpriselugs on opposite sides of one or both ofthe uprights 2 of the bracket 0, and which lugs are provided withsuitable screws, whose position may be varied at will 'to limit therockingmovement of the said pivotedframe.

In the initial ornormal condition ofinaction, as shown inthe drawings,the frame (Z is so maintained by means'of the weight 29,

rack 25, and pinion 26"that'the shafts e and are substantiallyhorizontal, and when the intermediate shaft 7 is turned the shaft 6 willbe turned in one direction through the gears 5 and6' and'that the shaftfwill'be turned'in the'opposite directionthrou h the gears 3 and 4, andin this position neit er-of the belts is sufliciently tautto drive themachine. If now the valve-stem of the cylinder is turned, whichin thefirst instance may be done manually orat' all times, if'so desired, thepiston will be actuate'd to rocktlie frame d in one direction or'theotherto tighten one or the other of said belts to drive the machine inthe desired direction, depending of course upon the direction in whichthe piston was moved and the direction of rotation of theintermediateshaft 7, After starting the mamade automatically by theautomatic control of the valve-stem throu h the arms, rods, dogs, andstops, as herein efore described, or manually. Itwill also be apparentwith reference to Fig. 4 that'should itbe inconvenient to drivethemechanism'by an'intermediate shaft which is inalinementwith" the shaftsupon whichthe frame I) is pivotally mounted the drive may be effectedfromtheshaft 32 and suitable pulley and belt, the shaft 32 be ing placedin the same horizontal lane with the shafts e and f and'thepivotashaftsd when these latter shafts are in-their central orhorizontal'position, thus dispensing with the gears 5 andG-andthe shafts7;

I claim as my invention 1; In a reversing mechanism for machineport,aframe pivotally mounted therein, shafts journaled inrsaid frame, apulley mounted on each of said shafts, means for turning saidshafts inopposite directions, a

drive-shaft for the'machine to be-operated,

ulleys thereon, belts passing around theast-aforesaid pulleys andrespectively around the pulleys mounted in said *frame, means forrocking said frame in one direction or the other to tighten one or'theother of said belts, and means for automatically returning and'normallymaintainingsaid'frame in a horizontal position when inoperative.

2. In a reversmgmechanismfor machinetools and the like, and incombination, a support,. a frame pivotally mounted therein, shaftsjournaled in said frame, a pulley mounted on each of said shafts, meansfor turning said shafts in opposite directions, a drive-shaft for themachine to be operated, a pulley thereon, belts passing around the lastaforesaid pulley and respectively around the pulleys mounted in saidframe, means for rocking said frame in one direction or the other totighten one or the other of said belts, means for automaticallyoperating the last-aforesaid means, and means for automaticallyreturning and maintaining said frame normally in a horizontal positionwhen inoperative.

3. In a reversing mechanism for machinetools and the like, and incombination, a suport a frame )ivotall mounted therein,

shafts journaled in said frame, a pulley mounted on each of said shafts,means for turning sa1d shafts in opposite directions, a

drive-shaft for the machine to be operated,

other to tighten one or the other of said helts, means for automaticallyreturning and maintaining said frame normally in positlon wheninoperative, and means for limiting the rocking movement of said frame.chine the reversals may, asillustrated, be:

4. In a reversing mechanism for machinetoolsand the like, and incombination, a support, a frame pivotally mounted therein, shaftsournaled in said frame, a pulley mounted on each of said shafts, meansfor turning said shafts 1n opposite dlrections, a

'drive-shaftfor the machine to be operated,

a pulley thereon, belts passing around the last-aforesaid pulley andrespectively around the pulleys mounted in said frame, means for rockingsaid frame in one direction or the other to tighten one or the other ofsaid .ing movement of said frame. tools and the like, andin'combma-tlon; asup- 5. In a reversing mechanism for machinef tools andthe like and in combination, a support, a frame ivotally mountedtherein, shafts journaled in said frame, a pulley mounted on each ofsaid shafts, a gear on the endof one of said shafts, a gear on thecorresponding end of the other of said shafts,

andrespectively around the pulleys mounted in said frame, a cylinder, apiston therein, a

. when inoperative.

6. In a reversing mechanism for machinetools and the like, and incombination, a sup port, a frame ivotally mounted therein, shaftsjournaled in said frame, a pulley mounted on each of said shafts, a gearonthe end of one of said shafts, a gear on the corresponding end of theother of said shafts, said gears meshing with one another, means forturning one of said shafts whereby the other of'said shafts turns inthe'opposite direction through said gears, a drive-shaft for the machineto be operated, a pulley thereon, belts passing around thelast-aforesaid pulley and sai frame, a cylinder, a piston therein, apiston-rod therefor, a connection between the said piston-rod-and thesaid frame, means for automatically controlling the operation of saidpiston to determine the direction in which the said frame is to berocked, and adjustable stops placed on both sides of said support forimiting the rocking movement of said frame.

Signed by me this 8th day of December,

FRANCIS B. COCKBURN. Witnesses: C. W. B. JoNEs, HENRY EGGERDING.

respectively around the pulleys mounted in-

